Interesting. How many stops different do you think they are? And you said with evaluative you were getting the opposite. I'll have to try this myself.
Jun 02, 2011 21:00 | #16 Interesting. How many stops different do you think they are? And you said with evaluative you were getting the opposite. I'll have to try this myself. Image Editing OK
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msowsun "approx 8mm"  More info | Jun 02, 2011 21:03 | #17 Evaluative without  Evaluative with diffuser  Evaluative without  Evaluative with diffuser  Evaluative without  Evaluative with diffuser  Mike Sowsun / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.4 USM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 100-400 II / EF 1.4x II
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msowsun "approx 8mm" More info | Jun 02, 2011 21:05 | #18 Evaluative without  Evaluative with diffuser  Evaluative without  Evaluative with diffuser  Mike Sowsun / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.4 USM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 100-400 II / EF 1.4x II
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Jun 02, 2011 21:59 | #19 Hmm. I re-read that forum thread and several people had confirmed the under exposure. I am going to have to try this myself. Image Editing OK
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msowsun "approx 8mm" More info | Jun 02, 2011 22:06 | #20 digital paradise wrote in post #12526155  Hmm. I re-read that forum thread and several people had confirmed the under exposure. I am going to have to try this myself. Using the Stofen type diffuser, I got underexposure with Evaluative ETTL, but got similar or slightly brighter results with Average ETTL metering. Mike Sowsun / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.4 USM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 100-400 II / EF 1.4x II
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Wilt Reader's Digest Condensed version of War and Peace [POTN Vol 1]  More info | Jun 02, 2011 23:14 | #21 Boy, it started to seem like rampant thread drift, so I had to re-read the OP to verify what the original topic was! Interestingly, it seems the apparent recent drift about modifiers is not so far off topic, since OP discussed the issue of lens distance reporting. So here is a test which I just did. All shots processed with identical values (only White Balance was neutralized, to balance flashhead-only shot to the softbox modifier shot).  All shots taken at ISO 100, f/5.6. In each row, the sequence of shots is
First row is using Canon 17-55mm (lens distance reporting) Second row is using Tamron 28-75mm EF mount lens (unknown lens distance reporting) Third row is using Tamron 90mm f/2.5 Tamron Adaptall mount (no lens distance reporting) Interestingly, with Canon 17-55, exposure is pretty good with and without softbox modifier. But with Tamron 28-75, the modifier shot is brighter, but with Tamron 90mm the modifier shot is darker. As I stated earlier, it is puzzling what variable controls the effect of putting the modifier on the flashhead fired straight forward! You need to give me OK to edit your image and repost! Keep POTN alive and well with member support https://photography-on-the.net/forum/donate.php
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Jun 02, 2011 23:38 | #22 That is interesting. The Canon lens came through quite nicely. I just tried my 5D2 and 7D with my 24-105. I do not have a proper diffuser so I used a plastic jug. The WB was way off but I did not see an exposure drop in Evaluative like mike did. I'm not really comparing apples to apples. Image Editing OK
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Jun 03, 2011 07:16 | #23 I read it again. The OP started with a small softbox and then went to a Stofen. Had the same issue with any modifier he used. I also noticed his 430 worked the same diffuser or not. So this one just keeps getting gets stranger. Image Editing OK
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Jun 07, 2011 14:53 | #24 Wilt wrote in post #12526514 Boy, it started to seem like rampant thread drift, so I had to re-read the OP to verify what the original topic was! Interestingly, it seems the apparent recent drift about modifiers is not so far off topic, since OP discussed the issue of lens distance reporting. So here is a test which I just did. All shots processed with identical values (only White Balance was neutralized, to balance flashhead-only shot to the softbox modifier shot). All shots taken at ISO 100, f/5.6. In each row, the sequence of shots is
First row is using Canon 17-55mm (lens distance reporting) Second row is using Tamron 28-75mm EF mount lens (unknown lens distance reporting) Third row is using Tamron 90mm f/2.5 Tamron Adaptall mount (no lens distance reporting) Interestingly, with Canon 17-55, exposure is pretty good with and without softbox modifier. But with Tamron 28-75, the modifier shot is brighter, but with Tamron 90mm the modifier shot is darker. As I stated earlier, it is puzzling what variable controls the effect of putting the modifier on the flashhead fired straight forward! Which flash did you use? Image Editing OK
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Wilt Reader's Digest Condensed version of War and Peace [POTN Vol 1] More info | Jun 07, 2011 16:44 | #25 digital paradise wrote in post #12552989 Which flash did you use? The flash happened to be Metz...but keep in mind that the flash itself is under the commands issued by the camera, first to pre-flash, then to send a pre-determined (by the camera) amount of light out to the scene. And Ialso, PaceAce (moderator) used both Metz and Canon brand flashes for his tests, and got inconsistency in outcomes based upon something other than flash brand! You need to give me OK to edit your image and repost! Keep POTN alive and well with member support https://photography-on-the.net/forum/donate.php
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